*{
    margin: 0 auto;
    padding: 0;
    box-sizing: border-box;
}
.cent{
    width: 870px;
    margin: 0 auto;
}
.header{
    background-color: #54afdb;
    color: #fff;
}
.header a{
    color: #ffffff;
}
.nav{
    padding-top: 12px;
    padding-bottom: 12px;
}
.col{
    width: 33.333333%;
    float: left;
}
.nav:after{
    content: "";
    display: table;
    clear: both;
}
.nav a img{
    display: none;
}
.col-left{
    height: 10px;
}
.col-top{
    text-align: center;
}
.col-right{
    text-align: right;
    font-size: 12px;
    font-weight: bold;
}
a{
    text-decoration: none;
}
.col-right{
    position: relative;
    top: 5px;
}
.banner .col{
    width: 50%;
    float: left;
}
.banner:after{
    content: "";
    display: block;
    clear: both;
}
.cent:after{
    content: "";
    display: block;
    clear: both;
}
.banner p{
    font-weight: bold;
}
.banner h1{
    font-weight: 300;
    font-size: 36px;
    padding-bottom: 24px;
}
.banner a{
    background-color: #2996cc;
    padding: 15px 50px;
    display: inline-block;
    font-weight: bold;
    font-size: 12px;
    transition: 1s;
}
.banner a:hover{
   background-color: #0e6aca;
}
.banner img{
    width: 100%;
    display: block;
}
.list{
    margin-top: 60px;
    border-bottom: 1px solid #e0e0e0;
    padding-bottom: 60px;
}
.list .col{
    width: 25%;
    float: left;
    text-align: center;
    padding-left: 10px;
    padding-right: 10px;
}
.list img{
    margin-bottom: 10px;
}
.list h3{
    font-size: 13px;
    margin-bottom: 10px;
}
.list p{
    font-size: 14px;
    color: #778191;
}
.ddd{
    text-align: center;
    margin-top: 60px;
    margin-bottom: 60px;
}
.ddd h2{
    font-size: 32px;
    font-weight: 300;
    color: #2e3b4e;
    margin-bottom: 30px;
}
.ddd p{
    color:#7c8595;
    margin-bottom: 30px;
}
footer{
    background-color: #1b2126;
}
footer p{
    line-height: 120px;
    color: #6a787f;
}
@media (max-width: 600px) {
    .cent{
        width: 80%;
    }
    .banner .col{
        width: 100%;
        text-align: center;
    }
    .banner a{
        margin-bottom: 20px;
    }
    .nav a span{
        display: none;
    }
    .nav a img{
        display: inline-block;
    }

    .list .col{
        width: 100%;
    }
    .ddd a{
        width: 80%;
    }
    .ddd img{
        margin: 10px;
    }
}